[PATCH 11/27] ext4: use reserved metadata blocks when splitting extent on endio

Zhang Yi
2024-10-22T03:12:58Z

From: Zhang Yi <yi.zhang@huawei.com>

When performing buffered writes, we may need to split and convert an
unwritten extent into a written one during the end I/O process. However,
we do not reserve space specifically for these metadata changes, we only
reserve 2% of space or 4096 blocks. To address this, we use
EXT4_GET_BLOCKS_PRE_IO to potentially split extents in advance and
EXT4_GET_BLOCKS_METADATA_NOFAIL to utilize reserved space if necessary.

These two approaches can reduce the likelihood of running out of space
and losing data. However, these methods are merely best efforts, we
could still run out of space, and there is not much difference between
converting an extent during the writeback process and the end I/O
process, it won't increase the rick of losing data if we postpone the
conversion.

Therefore, also use EXT4_GET_BLOCKS_METADATA_NOFAIL in
ext4_convert_unwritten_extents_endio() to prepare for the buffered I/O
iomap conversion, which may perform extent conversion during the end I/O
process.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
---
fs/ext4/extents.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d5067d5aa449..33bc2cc5aff4 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3767,6 +3767,8 @@ ext4_convert_unwritten_extents_endio(handle_t *handle, struct inode *inode,
* illegal.
*/
if (ee_block != map->m_lblk || ee_len > map->m_len) {
+ int flags = EXT4_GET_BLOCKS_CONVERT |
+ EXT4_GET_BLOCKS_METADATA_NOFAIL;
#ifdef CONFIG_EXT4_DEBUG
ext4_warning(inode->i_sb, "Inode (%ld) finished: extent logical block %llu,"
" len %u; IO logical block %llu, len %u",
@@ -3774,7 +3776,7 @@ ext4_convert_unwritten_extents_endio(handle_t *handle, struct inode *inode,
(unsigned long long)map->m_lblk, map->m_len);
#endif
path = ext4_split_convert_extents(handle, inode, map, path,
- EXT4_GET_BLOCKS_CONVERT, NULL);
+ flags, NULL);
if (IS_ERR(path))
return path;

--
2.46.1